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Hi,
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the 4 wheel low light will usually only blink because the low gear is meant for a very slow speed and usually wont activate with the vehicle in motion i would have to say the sudden switch to 4x4 though would probably be a short in the wiring some place

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Could be 2 or 3 different things. Find the Trouble Code by Grounding out the 13th point in the plug, where the analizer (under the dash) would plug in. Turn the key on but don't start the engine. Count the blinks of the 4 wheel drive lights. 4 total blinks or 3,2,1. Each blink tells you where the problem is located: Switch, control modem, shift motor, or wiring. Ask your Chevy garage for the code information out of manual. GOD BLESS & GOOD LUCK....

you will know if you are in 4wd if you take it on a dry road. you will feel it fighting you when you turn sharp.. as for the blinking lights . that's your truck saying..........please take me in for some servise

B4 you pay the $600 check the vacuum lines, the one near the top center of the firewall. Mine was disconnected I plugged it in and I then had my 4x4 back after 3 yrs. My light would just blink and never engage. hope this helps

Hi, you will need to take it to mitsubishi dealer and have them scan. But it sounds like o ring in 4 wheel drive has busted. Does it still go in and out of 2 and 4 wheel drive? If it does it is safe to drive with blinking...if not it may do alot of damage.

it is flashing a code at u, this indicates the coiled rotating contact under the steering wheel has an open circuit in the airbag connection to the steering column, this contact is called the airbag clock-spring rotating contact, the steering wheel must be removed to replace it, CAUTION: The Airbag must be dis-armed before you remove it from the steering wheel, if it goes off u can be seriously injured.

Have someone check the wheel speed sensors. One is probably bad and not sending data to the computer. This will shut off your ABS system and all-wheel drive, because the system can't read the speed of one of your wheels. It needs input from all 4 wheels for the systems to work.

I had this problem on my 1995 Montero. The 4-wheel-drive indicator lights wouldn't stop blinking when I switched from 4-wheel drive to 2-wheel drive. It turns out that I had a slow leak in one of the front tires. After I fixed the leak and made sure the pressure was the same in both front tires, the problem went away.
This made sense to me because if one tire is much lower in pressure, it's closer to the ground, i.e. has a smaller radius, and therefore rotates more quickly. The manual says to drive in a straight line when disengaging 4-wheel drive but with the lower tire pressure on one side it was the equivalent of driving in a circle.
You could try checking your tire pressures and see if that makes a difference. Hope this helps.